A toddler’s digestive system is more established than an infant’s but remains highly adaptable. The microbiome continues to diversify as children transition from milk-based diets to a wider range of solid foods. Fruits, vegetables, grains, and proteins introduce new fibers and nutrients that shape bacterial populations. https://natreninc.wordpress.com/2026/02/12/choosing-the-right-probiotics-for-pets-with-sensitive-stomachs/